Brake



Jan. 29, 1935. w J, ANDRES 1,989,181

BRAKE Filed Dec. 16, 1931 2 Sheets-Sheet 1 Y INVENTOR. l W|LL1AM J. ANDRES A TTORNE Y.

Jan. 29, 1935.

W. J. ANDRES BRAKE'v Filed Deo. 16, 1931 2 Sheets-Sheet 2 o 3 non. 5 TE RM yV D mN 6 3 A lu. l M m fm ,O/O

y A TTORNE Y.

Patented Jan. 29, 1935 UNITED .STATES '71,989,1s1ff, l Y

BRAKEY l i' I Williamf J. Andres; smith'V Bend', ina.; 'assign to' yBendix Aviation Corporation, lSouth Bendiflnd., ,u

a corporation ofDelawar'el Application December y16, 1931, sr'iaiNo;515814153 12 claims." (012188-578) connected between` the separable ends of the Y element.`

friction element. The toggle has its knee associated with suitable anchoring means arranged to take the torque in either forward or reverse braking.. t

- In one embodiment of thelnvention the separablel ends of a friction element are rigidly. connected tothe legs of a toggle. The knee of the toggle is positioned in a radial guide and the ends of the legs are tangential to the friction element; so that upon spreadingthe toggle..the friction element is deformed to engage the brak# ing surfaceofthe drum.- 1

As shown, the toggle is actuated by a lever pivoted on the kneeof the-'toggle with its fulcrum on the radial guide and intermediate the length of fthefriction element is 'a suitable adjusting device, to adjust the friction elementto compensatefor wear. e

An important object of the inventionl is'to provide a brake Structure having means forl increasing the effectiveness of the friction'elem'ent as the application of the applied force progresses.

vA salient feature of the invention is a friction element andmeans for applying the element vincluding means for deforming portions ofthe Another feature of `the invention is a friction element including a'split band and .means connected between lthe separable (ends of the band ncludingmeans for deforming the band vand means for taking the torque upon application of the brake.

Another feature of the invention isY aradially movable anchor and a toggle fulcrumed thereon for actuating the friction elements.

Other objects and features of the invention will appear from the following description takenv in connection with the drawings, which form a part of this specification, and in which:

Figure 1 is a vertical sectional view of a brake illustrating the friction element in side elevation;

Figure 2 is a sectional view substantiallyvon line 2 2, Figure 1;

Figure 3 is a sectional view substantially on line 3 3, Figure 1;

Figure 4 is a sectional view substantially on line 4 4, Figure 1;

Figure 5 is a vertical sectional view of a fragment of a brake illustrating a modified form of the invention;

'formi ofthe invention; andi 5 Figure"8 isa'partiv l ectional view on the line 88 of.Figure7.;4 ,l

Referring Yto "the v awingsff'ormorev specific details of .thenA invention, 'lllvrepresents a; fixed support. such as ajbacking plate which; maybe of relatively thinl j material "since no stressesl or strains are :imposedthereon' andits only function is that'of'a dustshield." l I, Associated with the ybacking plate is a fixed support" 12 which'may be secured vto an" axle or to answveling jknuckle,not shown; together withvthegbacking plate; ,Thefjsupport 12 has formed thereon a' radial-torque; arm 14Hsupporting a rectangular"housingl 16 and associated with the backing plate andfsupport is a rotatable drum 1,8 which maybe secured toa wheel, lnot shown.

d Positioned within therdrum and adaptable *for cooperation therewithtis a friction element cluding a single split'band'ZO '-having secured thereto a frictionlining ,22 adapted to engage the face ofthe drum., AS1 shown, the band has intermediatev its length 'a loop 124 in rwhich vis positioned a wedge-shaped'm'ember 26 connected by a screw 28 to the band so that uponA tightening, the screw 28fthe band may be adjusted to compensate for wear on v'thefriction llining 22.'

The separable eids of Ytl ien,'.b"i nd 20 are def formed to provide'channeled sections 30 in which ,are rivetedofr otherwise V)se'zurged corresponding arcuateklinks 3'2"@` These linksarve connected to "the.bmdiriterediattheir length- The adjacent 'ends'of the-links are'fcon'ected bya pivot 34 having positioned thereon rollers .36 and 38 arranged on opposite sides vof the links and adapted to travel on the inner wall of the housing'16. Theband anchors at one end or the other,- according to the direction the drum is turning, through one or the other of the links 32 and therollers 36 and 38, the torque being transmitted by the rollers to the stationary housing 16. The rollers in effect constitute a radially movable brake anchonwth the housing as a guide therefor. The band when applied tends to be somewhat ofan ellipse, i. e. its opposite sides are bulged outwardly. The other ends of the links have curved surfaces 40 tangential to the inner surface ofthe band. The free ends of the links 32 are connected by suitable return springs 42 and 44 to the torque'arm 14.

Pivoted on'the pvot 34'between the links 32 sectional view substantially on is a lever 46 fulcrumed in the wall of the housing 16 as indicated at 48. The force applying end of this lever is suitably connected through a rod or cable to an operating means, not shown.

A modification of the invention is illustrated in Figure 5. In this modification the pivot pin 34 extends through a suitable opening 52 in the torque taking `arm and' .the backingp'late. Suitably securedon the pivot are levers 54 and 56 fulcrumed in the wall of the housing, and the pivot alsol has suitably secured thereto an operating lever 58. The anchorage, as in the rst emr bodiment, is by engagementof the rollers 36 and Y 38 with the housing.

for spreading the toggle. In this casealso the anchorage is by engagement of the ollersliwith-f the housing.

In' b'o'ththe'preferedandfxnoed forms' of the inventionwhen force vis applied 'tothe op'- eratinglever thefriction element is moved bodily through the toggle toffengage ZtlieQdr-ilm diametrically opposite the ariihtrl'fllp-o1i `.further appIication of forcethe friction element 'is/deformed by the toggle toprogressively engage the. `drum throughout its lebst/h. 'f v Although inventionhas been Adrscribedfin corniection `with .certain .specific embodiments, the principles .involved are ysusceptible of.V numerous other applications that will readily voccur to persons `skilled in..the art;A The. invention.` is, therefore, to .be limited only' asindcate'd the scope of the appended claims,` Having .thus ...described` the various vfeatures-of the invention, vwhat kI claim. as neilflandJ desire to lsecureby Letters Patent y 1. A brake comprising a friction element inlcluding a normally-circularband.having separa- .ble ends and ymeansffor `applying the;.friction element including-.members rigidly co'n'nected"` to they ends ofthe and 'a,pi vot.directly conneting the-ends@ saidmmbers., l` j 2,' -A brake comprising a friotioy l 'element "including -a bandhaving. .separable ,ends andv ato'ggle having-itslegs rigidly secured to 'the Separable `ends. V 1 i. l 3'. A brake comprising a.Y friction I.element .including a band .having separable Aends, andla toggie having its .legs rigid-ly secured-to the ends .and means for actuating the toggle. n y

A- brake, comprising a friction element .including a. band ,having separable, ends," a ltoggle having arcuate,legsrigidlyz secured to the sepa.- rable ends andi-a1 ,lever i011actuating the-1.30318.

.the respective separable ends, the knee of the toggle positioned in the housing and a lever piv- -oted on the knee of the toggle and fulcrumed on the housing.

` y l Y "`f'f7'. Abra'ke comprising a fixed support, a radial A further modication'oftheinvention is'il-f lustrated in Figure '7 wherein one of the lin-ks 32 is extended as indicatedatA 6D to provide-a lever guide' on'f'thefixed-support, a member movable in-'theguideya pivot on the movable member, a friction element, links on the friction element connected through the pivot and operating means fulcrumed on the pvot. f 8,y A brake comprising a friction element, an anchor having'bodily movement Vradially of the brake and connected tojb'oth ends of `said ele'- 'mentyand `a stationary'w'guideengaged by said anchor. v 1 9, A brake comprisinga.friction element, an anchor 'therefor arranged to Amove bodily radially andjanoperating leverlfulc'rumed on the anchon. .i Y j 10. A .brake comprising a friction element having 'separable ends, a. drum 'cooperating with the friction element, av Vrigid support, a housing on the support'rbetweenthe separableendS, a `toggle connectingl'the separable ends having its `knee positioned within fthe housing, a lever pivotedjon 'the knee' and'jfulcrumed on the housing.` I'

u 11. A brake comprising a friction 'element having separable ends, a. drumarranged .for cof operation 'with the friction element, a xed' support, a housingv on the flirt-5d support between the separable ends,VV a togglejconne'cted between the separable ends having itsknee positioned within the housing, awlever pivotedto lthe knee and fulcrumed onv the housing and tensionmembers connectingjthelegs"of the'toggle to the fixed 12;'A brake 'comprisinga normally-circular friction element,*ancho'ragerneans arranged' for the ends ofthe frictio'nelem'ent, Vand means for distortingv said element in'shape, to apply it,`including members rigidly connected .to saidelement and 'engaging said"an ch' orage means and aipivotdirectly, connecting saidl members, .and 'applying'A means `lavcvtirl'g on said members. :A 

